摘要
冲击弹性波在混凝土中穿透深度大,对混凝土含水量不敏感,在水工领域混凝土损伤评价中被应用得较为广泛,目前已有研究将弹性波波速用于评估混凝土的荷载损伤、冻融损伤,尚未发现有利用冲击弹性波法评价碱骨料反应损伤度的研究。文中通过构建基于弹性波波速的碱骨料反应损伤度的计算公式,研究了受碱骨料反应影响的混凝土在加速养护过程中弹性波波速、宏观性能的演化规律。研究结果表明,发生碱骨料反应的混凝土试件中的弹性波波速、劈裂抗拉强度、自振频率均随着该试件膨胀率的增加而减小,试件的膨胀率、劈裂抗拉强度、自振频率与基于弹性波波速计算得到的试件损伤度有着良好的线性关系,相关系数的平方均在0. 968以上,说明弹性波波速可以很好地用来评价混凝土碱骨料反应的损伤度。
The impact echo method, because of the large penetration depth and not sensitive to water content of concrete, has been widely applied in the hydraulic field. Many scholars have applied the impact echo method to assess the load damage and the freeze-thaw damage, however, it has not been found that alkali-aggregate reaction damage was evaluated by impact elastic wave method. In this pa- per, the damage degree of alkali-aggregate reaction was calculated based on elastic wave velocity-, the evolution of elastic wave velocity and macroscopic property of concrete during alkali-aggregate reaction were studied. Results show that the elastic wave velocity, splitting tensile strength, the resonant frequency decrease with the increase of inflation rate ; expansion rate, splitting tensile strength, the resonant frequency has good linear relationship with damage degree, the square of con＇elation coefficient is above 0.968. Those all indicate that the elastic wave velocity is a good method to evaluate the damage degree of alkali-aggregate reaction of concrete.
作者
哨冠华
刘晨霞
李曙光
陈改新
卿龙邦
SHAO Guanhua;LIU Chenxia;LI Shuguang;CHEN Gaixin;QING Longbang(College of Civil Engineering,Hebei University of Technology,Tianjin 300401,China;State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of Water Resources and Hydropower Research,Beijing 100038,China)
出处
《华北水利水电大学学报（自然科学版）》
2018年第5期31-35,共5页
Journal of North China University of Water Resources and Electric Power：Natural Science Edition
基金
国家重点研发计划项目(2016YFB030360)
国家自然科学基金项目(51409284)
流域水循环模拟与调控国家重点实验室项目(2016TS10&SKL2017CG05)
关键词
混凝土
碱骨料反应
损伤评价
弹性波波速
concrete
alkali-aggregate reaction
damage evaluation
elastic wave velocity
